Intermittent Factors For Industrial Applications
Intermittent Factors For Industrial Applications
(OP)
I commonly observe that in most oil and gas projects, their associated design load calculations are tabulated in kW, kVArs in such a manner that all continuous, intermittent and standby loads are summed up separately and then applied with 1.00, 0.30, 0.10 diversity factors for continuous, intermittent and standby respectively. Then,
maximum running load = continuous loads*(1.0) + intermittent loads*(0.30)
Peak Load = continuous load*(1.0) + intermittent loads*(0.30) + standby loads*(0.10)
My questions:
1. Are the diversity factors: 0.30(for intermittent), 0.10 (for standby) an industry practice?
2. Is there an industry standard that specifies diversity factors for intermittent and standby loads?
maximum running load = continuous loads*(1.0) + intermittent loads*(0.30)
Peak Load = continuous load*(1.0) + intermittent loads*(0.30) + standby loads*(0.10)
My questions:
1. Are the diversity factors: 0.30(for intermittent), 0.10 (for standby) an industry practice?
2. Is there an industry standard that specifies diversity factors for intermittent and standby loads?






RE: Intermittent Factors For Industrial Applications
I am not aware of any standard. Lots of discussion on this site before. Conclusion was to make sure your calculation basis is reasonable and that you could defend it if challenged.
RE: Intermittent Factors For Industrial Applications
RE: Intermittent Factors For Industrial Applications
Loads in the 0.3 group may then be arbitrarily called intermittent and loads in the 0.1 group may be arbitrarily called standby.
The second step is to take a step back and look at the big picture. If process requirements require several motors in the "standby" group to operate simultaneously, then this must be factored in in some way. Consider ten motors running 10% of the time at random times versus ten motor running 10% of the time, but all at the same time.
Bill
--------------------
"Why not the best?"
Jimmy Carter